package lab02.test36;

/**
 * Created by AIR on 2017/11/9.
 */
public class Postgraduate extends Student{
    @Override
    String calGrader() {
        //成绩等级
        String  grade="";
        double avg=average();
        if (avg>=90&&avg<=100)
            grade="优秀";
            else if (avg>=80&&avg<=90)
                grade="良好";
            else if (avg>=70&&avg<=80)
                grade="一般";
            else if (avg>=70&&avg<=60)
                grade="及格";
            else
                grade="不及格";
            return  grade;





    }
}
